Envelop-fastener.



TRENGH'ARDJL ENVELOP FASTENER. APPLICATION FILED DE?. 19| 1913` HENRY TRENCHABnLJR., or New roten, ny.

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Application led December 19,v 1913. Serial No. 807,609.

l nection with the accompanying drawings, is

a specification, like letters on the drawings representing like parts. A

This invention relates to improvements in metallic fastening devices for envelops of the general class `having one or more soft metal wings LAfiers fastened to the body of the envelopn :tempted to be passed through al-hole in the flap thereof and bent downwardly to hold the said flap securely to the body of the envelop. The present improvement lies moreV particularly in the construction of the bendable wings or lingers of the metallic part of the fastener and will be readily understood by referring to the accompanying drawings, `in. which,

Figure l is a plan view of such an envelop as is described above with the improved fastener att-ached; Fig. 2 is an enlarged cross sectional view of the envelop shown in Fig. l with the prongs or fingers ,bent up ready to receive the flap, the line 2-2 in Fig. l indicating lthe plane of this section ;l Fig. 3 is an .enlarged plan view of the metallicpart of the improved fastener; Fig. 4 is a view of the fastener uponthe same scale as Fig. 3, partly in elevation andv partly in section; Fig. .5 is a cross sectional view of the fastener, the plane. of the se'ction being indicated by the line 5-5 1n Fi g.

A' serious disadvantage inherent in fastening devices of this class has been that in .bending up the prongs or fingers the bending will not always take place at the right point, i. e. at a point adjacent to but outside of the rim of the eyelet in this case. If the fingers bend at any other point, the hole 'in the flap will not litv down over the two lingers, causing delay and necessitating a straightening out of the fingers and a second bending; whereas if the fingers are too stiff the exterior rim of the eyelet is liable to be raised with the fingers, thus disengaging the eyelet from the envelop. To obviate these difficulties the present construction has been devised. f

Referring to the drawings, it will be seen that the improved fastener consists of an eyelet c adapted to pass through the body of an envelop Z) and be headed up on the inside, This eyelet has two wings or fingers c and CZ respectively continuous with and projecting from the exterior rim of the eyelet and which are adapted to be bent upwardly and passed through a hole e in a fiap. f of the envelop. The` hole in theflapl may be reinforced, as shown, by applying rings of heavy paper, cloth or iibroid thereto, ,such reinforcement being indicated by g and It. The bendable wings or fingers c and Z are embossed or deformed to provide reinforcing ribs or ridges c' and j extending longitudinally of each wing' from a point adjacent to the eyelet a' to the end or nearly to the end of the wings or fingers. A sufiicient space should be left between the inner ends of the ridges and rim of the eyelet to allo-w the wings to bend at that point. The construction and location of those reinforcing ridges will be readily understood from the enlarged detail Figs. 3, 4, and 5. The advantages over the flat wing possessed by the construction here shown will be obvious. The wings, being thusstrengthened and made rigid, will bend only at the proper points, here' indica-ted by and Z,

for the flap to be 4passed down over them; and, where an attaching eyelet is employed, will nottupset its exterior rim.

It will be understood that this invention applies not only to the particular 'type of wing fastener hereshown but to all metallic envelop fasteners'having one 'or more bendable prongs or fingers adapted to be bent up for insertion through the iap of an envelop and thereafter to be bent outwardly and downwardly to securely fasten. the flap to .the hedy'rof the envelop.

t claim 'as my invention:

lL. An envelop fastener, comprising an leyelet adaptedy to passthrough the body of an enveldp and be headed up on the inside, and

a fastening finger which is continuousy with with attachingmeans,4 and arms extending from the base in opposite directions4 and provided With a stitfening element extending lengthwisevof'the arms leaving aA fiat'boi`- der on opposite sides of said stifening ele- .ment and a` 'narrow space between the stieningelement and base.

3. A-fastener including a. base provided Awith attaching means, and Iarms extending inV opposite directions from the base, each arm being tapered from its root to-its tip and having a stiening element extending lengthwise thereof with a. flat-border exstifeningelement and the base.

4. A fastener including a hase provided With attaching means7 and arms extending opposite sides of the plication, and a'narrow .in opposite directions from the base, each v larm having a plicaticn extending from a -point a short distance from the hase length- Wise along the arms leaving a flat border on space between the ends of the plication and the base. A

In testimonyv whereof, I have signed my name to this specification, in the presence of 'Copies bf this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D.'C. 

